-7s+20=-9s-20

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Solution for -7s+20=-9s-20 equation: 



-7s+20=-9s-20

We move all terms to the left:

-7s+20-(-9s-20)=0

We get rid of parentheses

-7s+9s+20+20=0

We add all the numbers together, and all the variables

2s+40=0

We move all terms containing s to the left, all other terms to the right

2s=-40

s=-40/2

s=-20

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